PVS-Studio warning V595 for MongoDB

bool run(....)
{
  result.appendNumber( "fileSize" , d->fileSize() / scale );
  if( d )
    result.appendNumber( "nsSizeMB",
      (int) d->namespaceIndex.fileLength() / 1024 / 1024 );
}

This suspicious code was found in MongoDB project by PVS-Studio static code analyzer.
Warning message is:
V595 The 'd' pointer was utilized before it was verified against nullptr. Check lines: 1446, 1447. dbcommands.cpp 1446

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/